## Summary
Docs follow-up for #3683 (`TriggerClient` for per-instance SDK
configuration). Adds a dedicated reference page and threads the new
pattern through the existing management + preview-branches docs.
## What's in
**New page** `docs/management/multiple-clients.mdx` — when to use
`TriggerClient` vs `configure()` vs `auth.withAuth`, env-var fallback
rules, isolation contract, namespace surface, `inheritContext` opt-in,
and a when-to-use-what table.
**Updated pages**
- `docs/management/authentication.mdx` — rewrote the `auth.withAuth`
section to reflect the now-ALS-backed semantics (the prior version
warned about concurrency races and pointed at issue #3298 as a tracked
fix; that fix landed in #3683). Added `tr_preview_*` to the key prefix
list. Reframed the multi-target use case to lead with `TriggerClient`,
with `auth.withAuth` as the temporary-override helper.
- `docs/management/overview.mdx` — added a `Multiple clients in one
process` subsection.
- `docs/deployment/preview-branches.mdx` — added a `Triggering across
multiple branches from one process` example.
- `docs/triggering.mdx` — one-liner pointing at the new page for
cross-project triggering.
- `docs/docs.json` — slotted `management/multiple-clients` into the
Management API nav, right after authentication.
Paired with #3683.
## Test plan
- [ ] Mintlify preview renders cleanly
- [ ] Code samples in each updated page run as documented
- [ ] Cross-page links resolve (`/management/multiple-clients`,
`/management/authentication`)
Eric Allam